PPT-Contraction, depolarization, and repolarization

Physiology of the Heart Mechanism and Events of Contraction 1 Influx of sodium ions from the extracellular fluid into the cells initiates the action potential by opening voltageregulated sodium channels . Review Principles of Muscle Mechanics. Same principles apply to contraction of a single fiber and a whole muscle. Contraction produces tension, the force exerted on the load or object to be moved. Review Principles of Muscle Mechanics. 11.2. Learning Objectives. Explain the sliding filament mechanism. State what evidence supports the sliding filament mechanism. Explain where the energy comes from for muscle contraction. Success Criteria. Circuits of the Blood. There are 3 circuits:. Systemic Circulation. From the left ventricle to the aorta and on to the body. Back to the heart via the superior and inferior vena cava to the right atrium. Membrane Potential . = difference in electrical charges between inside & outside of neuron. http://highered.mheducation.com/sites/0072495855/student_view0/chapter14/animation__the_nerve_impulse.html. Cardiac Muscle Contraction. Depolarization of the heart is rhythmic and spontaneous. About 1% of cardiac cells have automaticity— (are self-excitable). Gap junctions ensure the heart contracts as a unit. Neurotransmitter must stimulate muscle.. This happens at the neuromuscular junction.. Axon of neuron,. ‘Synaptic bulb’. Muscle. AcH. Formed by. Muscle fiber. membrane. The space = synapse, synaptic. OBJECTIVES. Define. . the action potential.. Describe. the . changes. . during action potential.. Discuss . conduction. (propagation) of action potential. Describe . recording . of . monophasic. Cardiac Muscle Contraction. Depolarization of the heart is rhythmic and spontaneous. About 1% of cardiac cells have automaticity— (are self-excitable). Gap junctions ensure the heart contracts as a unit. THE CIRCULATORY SYSTEM Ch. 18 The HEART ASSIGNMENT : Most Of The Anatomy We Have Already Done In The Lab, So Make Sure To Do The * of slide 1 through 29. As I Will Likely Not Take The Time To Review This Material. Cardiac Muscle Contraction. Depolarization of the heart is rhythmic and spontaneous. About 1% of cardiac cells have automaticity— (are self-excitable). Gap junctions ensure the heart contracts as a unit. x  Cardiac Muscle Contraction. Depolarization of the heart is rhythmic and spontaneous. About 1% of cardiac cells have automaticity— (are self-excitable). Gap junctions ensure the heart contracts as a unit. Same principles apply to contraction of a single fiber and a whole muscle. Contraction produces tension, the force exerted on the load or object to be moved. Review Principles of Muscle Mechanics. Contraction does not always shorten a muscle:. October . 24 - 25 2017. Muscle . Structure. Muscle. Fascicle (bundle of fibers). Muscle . Fiber (single cell). Myofibril (organelle). Sarcomere (unit of contraction). Microscopic Anatomy of Skeletal Muscle.